Question

It is more positive than the resting potential. (TRUE)

Voltage-gated potassium channels begin to close.
The membrane begins to hyperpolarize.
Threshold for a typical neuron is approximately -30 mV.
Voltage-gated potassium channels begin to open.
a. The membrane is hyperpolarized during an action potential.
b. The threshold for a typical neuron is -70 mV.
c. Voltage-gated potassium channels open during depolarization.
d. The statement about the resting potential is true.

Answer 1

The statement that is true about threshold for an action potential is A) It is more positive than the resting membrane potential.

What is true of the threshold for an action potential ?

The threshold for an action potential is more positive than the resting membrane potential. The resting potential is typically around -70 mV, and the threshold potential is usually around -55 to -60 mV.

Voltage-gated potassium channels open later in the action potential, primarily during repolarization, not at the threshold. At the threshold, it's the voltage-gated sodium channels that open, leading to depolarization. Potassium channels open later.

Hyperpolarization occurs after the peak of the action potential, not at the threshold.

The full question is:

Which of the following is true about threshold for an action potential?

A) It is more positive than the resting membrane potential.

B) Voltage-gated potassium channels begin to close.

C) Voltage-gated potassium channels begin to open.

D) The membrane begins to hyperpolarize.

E) Threshold for a typical neuron is approximately -30 mV.